Oil Filler Cap and O-ring. Porsche 986 Boxster / 996  ❭  99610703550

Oil Filler Cap and O-ring
OE Match oil filler cap and O-ring for Porsche 986 Boxster and 996 models. This replacement cap helps seal the engine oil filler neck, preventing oil vapour leaks, contamination, and loss of correct crankcase sealing.

Fits:
Porsche 986 Boxster 1997 - 2004
Porsche 996 C2 / C4 / C4S 1998 - 2004
Porsche 996 Turbo / GT2
Porsche 996 GT3 2000 - 2005

Diagram ref no 18

The oil filler cap closes and seals the oil filler neck after engine oil has been added. The O-ring helps prevent oil vapour escape, oil seepage, dirt entry, and poor sealing within the engine lubrication and crankcase ventilation system.

Functions
•  Replaces the engine oil filler cap, includes sealing O-ring
•  Seals the oil filler neck
•  Helps prevent oil vapour and oil seepage
•  Helps stop dirt and debris entering the engine oil system
•  Supports correct crankcase ventilation sealing
•  OE Match replacement for Porsche 986 Boxster and 996 oil service.

Why Replace This Part?
Oil filler caps and O-rings can wear, harden, crack, loosen, or lose sealing ability due to age, heat, oil exposure, and repeated removal during servicing. A faulty cap or seal can cause oil vapour smells, minor oil seepage, poor crankcase sealing, or contamination risk. Replacing the cap and O-ring helps restore proper oil filler sealing and a clean engine bay.

When to Replace This Part
•  The oil filler cap is cracked, loose, missing, or damaged
•  The O-ring is hard, flattened, split, or missing
•  Oil vapour smell is present around the filler area
•  Oil seepage is visible near the filler neck
•  The cap no longer tightens or seals correctly
•  Engine oil service is being carried out
•  The vehicle is undergoing Porsche 986 Boxster or 996 engine bay restoration.

Where it fits on the car
This cap and O-ring fit at the engine oil filler neck on Porsche 986 Boxster and 996 models. It forms part of the engine lubrication sealing system.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99610703550

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